Cleansing agent composition

Abstract

To provide a cleansing agent composition which achieves high storage stability and also exhibits high foamability, thereby offering pleasant user sensation.SOLUTION: A cleansing agent composition comprises a carbonate, an organic acid, a surfactant, and a moisture absorbent. The content of the surfactant in the composition is more than 5 mass%, and the content of the moisture absorbent is more than 5 mass%.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a detergent composition.

Background Art

[0002] A mixture of carbonate and organic acid generates carbon dioxide gas by adding a small amount of water. Utilizing this property, a technology for cosmetics that generates fine bubbles of carbon dioxide gas has been reported (Patent Document 1). However, a mixture of carbonate and organic acid generates carbon dioxide gas during storage even in the presence of a trace amount of water, and water is generated as a by-product by the reaction, so the reaction occurs chain-reaction, resulting in problems such as swelling of the packaging material or a decrease in foaming property during use.

[0003] Regarding this problem, technologies for improving storage stability have been reported. For example, Patent Document 2 discloses a briquette preparation having improved storage stability by containing polyethylene glycol and polyvinylpyrrolidone. Further, Patent Document 3 discloses a bath agent having good storage stability by containing the following components (A) to (C): (A) 25 to 55% by mass of an alkali metal carbonate in which particles having a particle size of 180 μm or more are 50% or more, (B) 40 to 70% by mass of an organic acid in which particles having a particle size of 180 μm or more are 50% or more, and (C) 0.01 to 10% by mass of a hardly water-soluble metal oxide.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the technical fields and required functions and effects of bath agents and detergents are different. When these technologies are applied to detergents, for example, when a solid polymer compound such as polyethylene glycol is used at room temperature, the storage stability increases, but the immediate solubility of the detergent decreases, resulting in a deteriorated feel during use or a delay in foaming. Also, when a poorly water-soluble metal oxide is incorporated into the detergent, the foaming property of the detergent deteriorates. Therefore, it has been found that the detergency and usability as a detergent are impaired. Accordingly, an object of the present invention is to provide a detergent composition that has high storage stability and can ensure detergency as a detergent.

Means for Solving the Problems

[0006] Therefore, as a result of various studies on the technology of detergents that foam with carbonates, organic acids, and surfactants, the inventors have found that by containing a specific amount or more of a humectant and a surfactant, the storage stability of the detergent composition can be ensured without reducing the immediate solubility, and good foaming properties can be ensured. That is, the present invention is a detergent composition containing a carbonate, an organic acid, a surfactant, and a humectant, relating to a detergent composition in which the content of the surfactant in the composition is more than 5% by mass and the content of the humectant is more than 5% by mass.

Effects of the Invention

[0007] By using the detergent composition of the present invention, a detergent having high storage stability and good foaming properties can be obtained.

Modes for Carrying Out the Invention

[0008] [Detergent Composition] The detergent composition of the present invention is a solid detergent composition containing a carbonate, an organic acid, a surfactant, and a humectant, in which the content of the surfactant in the composition is more than 5% by mass and the content of the humectant is more than 5% by mass. By having the above configuration, the cleaning composition of the present invention has high storage stability. By adding water to the cleaning composition and dissolving it, a foamed cleaning agent can be obtained without performing a foaming operation such as rubbing with the palm of the hand. Hereinafter, in this specification, a cleaning agent foamed by adding water to a cleaning composition is also referred to as a "foamed cleaning agent".

[0009] The reason why the cleaning composition of the present invention has high storage stability and high foaming property is not clear, but it is considered as follows. The cleaning composition of the present invention contains a desiccant in an amount more than a specific amount. Therefore, moisture contained in the air reacts with the desiccant, suppressing the generation of carbon dioxide gas during storage of the cleaning composition. Thus, the cleaning composition of the present invention is considered to have high storage stability. On the other hand, as a result of various studies by the present inventors, since the metal oxide used as the desiccant is hardly soluble in water, even when a composition containing a carbonate, an organic acid, a surfactant, and a metal oxide is dissolved in water, it does not foam or, even if it foams, does not produce a sufficient amount of foam. In contrast, the cleaning composition of the present invention has high foaming property despite containing a desiccant in an amount more than a specific amount. This is considered to be because when the cleaning composition of the present invention is dissolved in water, the desiccant is dispersed by the surfactant, and the surface tension of the entire solution can be lowered. Therefore, it is considered that the cleaning composition of the present invention has high foaming property and a cleaning agent with good usability can be obtained.

[0010] <Carbonate> The cleaning composition of the present invention contains a carbonate. When the cleaning composition is dissolved in water, the carbonate generates carbon dioxide gas by acting with an organic acid, and thus excellent detergency can be exhibited.

[0011] Examples of the carbonate include dialkali metal carbonates such as sodium carbonate and potassium carbonate, alkaline earth metal carbonates such as calcium carbonate and magnesium carbonate, and alkali metal hydrogen carbonates such as sodium hydrogen carbonate and potassium hydrogen carbonate. One or more of these can be used. Among these, from the viewpoint of foamability, one or more selected from the group consisting of sodium carbonate and sodium hydrogen carbonate are preferable, and sodium hydrogen carbonate is more preferable.

[0012] From the viewpoint of improving foamability, the content of the carbonate in the detergent composition is preferably 10% by mass or more, more preferably 15% by mass or more, and still more preferably 20% by mass or more. Also, from the viewpoint of improving foam retention, it is preferably 60% by mass or less, more preferably 55% by mass or less, and still more preferably 50% by mass or less.

[0013] <Organic acid> The detergent composition of the present invention contains an organic acid. Examples of the organic acid include citric acid, tartaric acid, malic acid, malonic acid, pyridonecarboxylic acid, succinic acid, fumaric acid, adipic acid, glutaric acid, ascorbic acid, etc. One or more of these organic acids can be used, and one or more selected from the group consisting of citric acid, tartaric acid, succinic acid, and ascorbic acid are preferable, and citric acid is more preferable.

[0014] From the viewpoint of improving foamability, the content of the organic acid in the detergent composition is preferably 5% by mass or more, more preferably 7% by mass or more, and still more preferably 10% by mass or more. Also, from the viewpoint of keeping the pH of the foaming detergent in a suitable range, it is preferably 60% by mass or less, more preferably 55% by mass or less, still more preferably 50% by mass or less, even more preferably 35% by mass or less, and even more preferably 20% by mass or less.

[0015] <Surfactant> The detergent composition of the present invention contains a surfactant. Examples of the surfactant include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants, and one or more of each can be arbitrarily selected and used. Among them, anionic surfactants are preferred from the viewpoints of good solubility in water and good foaming properties. Specific examples of each are shown below.

[0016] 〔Anionic surfactant〕 Specific examples of anionic surfactants include N-acyl amino acid salts, N-acyl-N-methyl amino acid salts, fatty acid salts, salts of esters of fatty acids having 5 to 18 carbon atoms and isethionic acid, alkyl or alkenyl sulfonates having 10 to 18 carbon atoms, polyoxyalkylene alkyl ether sulfate esters, and linear alkylbenzene sulfonates.

[0017] Examples of counterions of anionic groups of anionic surfactants include alkali metal ions such as sodium ions and potassium ions; alkaline earth metal ions such as calcium ions and magnesium ions; ammonium ions; alkanolammonium having 1 to 3 alkanol groups having 2 or 3 carbon atoms (for example, monoethanolammonium, diethanolammonium, triethanolammonium, triisopropanolammonium, etc.), and sodium ions and potassium ions are preferred, and sodium ions are more preferred.

[0018] 〔Cationic surfactant〕 Examples of cationic surfactants include quaternary ammonium salts such as alkyltrimethylammonium salts, alkoxyalkyltrimethylammonium salts, dialkyldimethylammonium salts, alkylamidealkyltrimethylammonium salts, benzalkonium chloride, and alkylpyridinium salts.

[0019] As counterions of the cationic groups of the cationic surfactant, examples include alkyl sulfate ions having 1 to 3 carbon atoms, sulfate ions, phosphate ions, carboxylic acid ions having 1 to 3 carbon atoms (formate ions, acetate ions, propionate ions), and halide ions such as chloride ions and bromide ions. Among these, from the viewpoints of ease of production and ease of obtaining raw materials, halide ions are preferred, and chloride ions are more preferred.

[0020] Amphoteric surfactant Examples of the amphoteric surfactant include at least one selected from alkylamine oxides having an alkyl group with 10 to 18 carbon atoms and alkylbetaines having an alkyl group with 10 to 18 carbon atoms.

[0021] Nonionic surfactant Examples of the nonionic surfactant include one or more selected from the group consisting of polyoxyethylene alkyl ether, polyoxyethylene alkenyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbit fatty acid ester, polyoxyethylene fatty acid ester, alkyl glucoside, alkyl alkanolamide, alkyl glyceryl ether, higher fatty acid sucrose ester, polyglycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, and alkyl saccharide.

[0022] From the viewpoint of improving foaming properties, the content of the surfactant in the detergent composition is more than 5% by mass, preferably 6% by mass or more, more preferably 8% by mass or more, and still more preferably 10% by mass or more. Also, from the viewpoint of improving foam drainage, it is preferably 40% by mass or less, more preferably 35% by mass or less, and still more preferably 30% by mass or less.

[0023] Humectant The detergent composition of the present invention contains a moisture absorbent. As the moisture absorbent, alkaline earth metal oxides such as magnesium oxide, calcium oxide, and zinc oxide are preferred. From the viewpoints of storage stability and foaming property, one or more selected from the group consisting of magnesium oxide are more preferred, and magnesium oxide is even more preferred.

[0024] From the viewpoint of improving storage stability, the content of the moisture absorbent in the detergent composition is more than 5% by mass, preferably 6% by mass or more, more preferably 8% by mass or more. Also, from the viewpoint of improving foaming property, it is preferably 20% by mass or less, more preferably 15% by mass or less.

[0025] The mass ratio of the surfactant content to the moisture absorbent content in the detergent composition (surfactant / moisture absorbent) is preferably 0.7 or more, more preferably 1 or more, even more preferably 1.5 or more, still more preferably 2.0 or more, and also preferably 5.0 or less, more preferably 4.5 or less, even more preferably 4.0 or less, from the viewpoint of achieving both storage stability and foaming property.

[0026] The mass ratio of the total content of carbonate and organic acid to the moisture absorbent content in the detergent composition (total content of carbonate and organic acid / moisture absorbent) is preferably 0.5 or more, more preferably 0.7 or more, even more preferably 1.0 or more, and also preferably 8.0 or less, more preferably 3.5 or less, even more preferably 2.0 or less, from the viewpoint of achieving both storage stability and foaming property.

[0027] From the viewpoint of improving storage stability, the total content of carbonate, organic acid, surfactant, and moisture absorbent in the detergent composition is preferably 70% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more.

[0028] In the detergent composition of the present invention, within a range not impairing the object of the present invention, as other components, components usually used in solid preparations can be appropriately contained. Examples of such components include excipients, binders, natural pigments, humectants, anti-inflammatory agents, bactericides, antiperspirants, antioxidants, fragrances, and mixtures thereof.

[0029] Examples of excipients include, for example, silicic acid, silicic anhydride (silica), magnesium silicate, calcium silicate, aluminum silicate, barium silicate, strontium silicate, diatomaceous earth, talc, sericite, mica, kaolin, montmorillonite, clay, bentonite, vermiculite, titanium oxide-coated mica (mica titanium), bismuth oxychloride, boron nitride, metal tungstates, hydroxyapatite, zeolite, ceramic powder, chlorohydroxyaluminum, aluminum chloride, aluminum sulfate, basic aluminum bromide, basic aluminum iodide, chlorohydroxyaluminum zirconium, zinc sulfate, basic aluminum zinc lactate, calcium sulfate, barium sulfate, magnesium sulfate, red iron oxide, ultramarine, navy blue, chromium hydroxide, calamine, carbon black, etc.; monosaccharides such as glucose, fructose, galactose, mannose, etc.; disaccharides such as lactose, trehalose, maltose, etc.; starches such as starch, potato starch, etc.; polysaccharides such as dextrin, (crystalline) cellulose, carrageenan, etc., sugar alcohols such as mannitol, maltitol, xylitol, erythritol, etc.; and the like.

[0030] (Dosage form) The dosage form (product form) of the cleaning composition of the present invention during use is not particularly limited, but from the viewpoint of handleability when dissolved in water and used, it is preferably a powder or a tablet, and more preferably a powder from the viewpoint of enhancing foaming properties and improving the feeling of use. When the cleaning composition of the present invention is a powder, it may be a powder containing a granulated powder of an organic acid, a surfactant, and other components used as necessary and a carbonate.

[0031] (Properties) The cleaning composition of the present invention is added to water and used after being dissolved. From the viewpoint of foaming properties, the pH of a 5% by mass aqueous solution of the cleaning composition at 25°C is preferably 5.8 or higher, more preferably 6.3 or higher, and preferably 7.8 or lower, more preferably 7.3 or lower.

[0032] [Method for manufacturing a detergent composition] The method for manufacturing the detergent composition of the present invention is not particularly limited. For example, it can be manufactured by blending a carbonate, an organic acid, a surfactant, a humectant, and other components used as necessary, and mixing them using a known stirring device or the like. When the detergent composition of the present invention is a granulated powder, a known method can be used as the granulation method. Examples thereof include a fluidized bed granulation method, a stirring granulation method, a rolling granulation method, an extrusion granulation method, and the like. Among these, from the viewpoint of improving the solubility of the detergent composition in water, the fluidized bed granulation method is preferable. Specifically, for example, raw materials other than the carbonate are charged into a fluidized bed granulator, and a binder solution in which a binder is dissolved in water, ethanol, or a mixed solution thereof is added to the uniformly mixed powder particles to perform granulation.

[0033] [Usage method] The detergent composition of the present invention can be suitably used, for example, for face washing, hair washing, and body washing. The detergent composition of the present invention is a foaming detergent composition that naturally starts to foam when water is added. Therefore, it foams quickly and there is no need to perform a special foaming operation, so it can be used easily. As a usage method of the detergent composition of the present invention, for example, take the detergent composition in the palm of the hand, add water to the detergent composition, confirm that it has foamed moderately, and then apply it to the face, hair, whole body, etc. to be washed and wash. The amount of water added to the detergent composition is not particularly limited, but from the viewpoint of improving the solubility of the detergent composition and also improving the detergency, the mass ratio of the detergent composition to the added water (detergent composition / water) is preferably 1 / 30 or more, more preferably 1 / 25 or more, still more preferably 1 / 20 or more, and preferably 1 / 0.5 or less, more preferably 1 / 1 or less, still more preferably 1 / 2 or less. The temperature of the water added to the detergent composition is not particularly limited, but it is preferably 15°C or higher and 45°C or lower. The detergent composition of the present invention can be suitably used for face care products such as facial cleansers, body care products such as hand soaps and body soaps, and hair care products such as shampoos.

Examples

[0034] Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to the scope of the examples.

[0035] (Preparation of mixed surfactant) 300 g of sodium N-myristoyl-L-glutamate (Amisoft MS manufactured by Ajinomoto Co., Inc.) and 291.5 g of sodium N-lauroyl-L-glutamate (Amisoft LS manufactured by Ajinomoto Co., Inc.) were mixed at room temperature to obtain a mixed surfactant.

[0036] Example 1 (Preparation of detergent composition) 14 g of citric acid (Citric anhydride 60 manufactured by Iwata Chemical Industry Co., Ltd.), 30 g of mixed surfactant, 5 g of talc (SW-K4 manufactured by Asada Flour Milling Co., Ltd.), 10 g of magnesium oxide, and 41 g of sodium hydrogen carbonate (manufactured by AGC Inc.) were put into a bag and manually mixed in a transparent plastic bag until visually uniform to prepare detergent composition 1.

[0037] (Storage stability test) 3.9 g of detergent composition 1 was sealed in an aluminum package of 80 mm × 50 mm × 18 mm at 50°C and 50% relative humidity, and the expansion volume of the bag before and after storage at 50°C for 4 weeks was measured. Specifically, a water tank filled with water at 25°C was placed on a scale and its weight was measured. Next, the aluminum package containing the detergent composition was completely submerged in the water tank and its mass was measured. The difference in mass before and after submerging the aluminum package in water was converted into volume using the density of water as 1.0 g / ml based on Archimedes' principle, and this was taken as the volume of the aluminum package before storage. Then, the same measurement was performed after 4 weeks of storage to obtain the volume of the aluminum package after storage, and the expansion amount of the aluminum package before and after storage was obtained from the difference in the volume of the aluminum package before and after storage. A smaller expansion amount indicates better storage stability. The results are shown in Table 1.

[0038] (Foaming test) 1.0 g (0.4 g as sodium hydrogen carbonate) of Detergent Composition 1 and 10 g of hot water at 42 °C were put into a graduated cylinder and stirred with a stirrer under the condition of 100 rpm. The amount of foam generated over time for 5 minutes was measured, and the amount of foam was evaluated as the foaming property. The results are shown in Table 1.

[0039] Examples 2 and 3, and Comparative Examples 1 and 2 Detergent Compositions 2 and 3, and Detergent Compositions C1 and C2 were prepared in the same manner as in Example 1, except that the blending amounts of the mixed surfactant, talc, and magnesium oxide were changed as shown in Table 1. The results of evaluating Detergent Compositions 2 and 3, and Detergent Compositions C1 and C2 in the same manner as in Example 1 are shown in Table 1.

[0040]

Table 1

[0041] From Table 1, it can be seen that Detergent Compositions 1 to 3 of this example are excellent in storage stability and have high foaming properties. On the other hand, Detergent Composition C1 in which the content of magnesium oxide as a hygroscopic agent is 5% by mass or less was inferior in storage stability compared with Detergent Compositions 1 to 3 of this example. Further, although Detergent Composition C2 in which the content of the surfactant is 5% by mass or less was excellent in storage stability like Detergent Compositions 1 to 3 of this example, its foaming property was inferior.

Industrial Applicability

[0042] According to the detergent composition of the present invention, a detergent having high storage stability and good foaming property can provide a good feeling in use such as the touch during use. The detergent composition can be used for face care products such as facial cleansers, body care products such as hand soap and body soap, and hair care products such as shampoos.

Claims

**Claim 1** A detergent composition containing a carbonate, an organic acid, a surfactant, and a humectant, wherein the content of the surfactant in the composition is more than 5% by mass and the content of the humectant in the composition is more than 5% by mass. **Claim 2** The detergent composition according to claim 1, wherein the content of the surfactant in the composition is 6% by mass or more. **Claim 3** The detergent composition according to claim 1 or 2, wherein the content of the humectant in the composition is 6% by mass or more. **Claim 4** The detergent composition according to any one of claims 1 to 3, wherein the mass ratio (surfactant / humectant) of the content of the surfactant in the composition to the content of the humectant in the composition is 0.5 or more and 5.0 or less. **Claim 5** The detergent composition according to any one of claims 1 to 4, wherein the organic acid is at least one selected from the group consisting of citric acid, tartaric acid, succinic acid, and ascorbic acid. **Claim 6** The detergent composition according to any one of claims 1 to 5, wherein the carbonate is at least one selected from the group consisting of sodium carbonate and sodium hydrogen carbonate. **Claim 7** The detergent composition according to any one of claims 1 to 6, wherein the humectant is magnesium oxide.

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